Simulation and Experimental Research on Temperature Field of Tightly Coupled Split Reactor Based on Fluid-Thermodynamic Temperature Field Analysis

At present, the research on tightly coupled split reactor is generally limited to its functions such as automatic current sharing/current limiting in parallel circuit breaker circuits, while the temperature rise of this type of reactor under continuous current is rarely studied. In order to evaluate the temperature rise under continuous current, this paper adopts the method of combining fluid-thermodynamic temperature field simulation analysis and experimental verification. The test results show that: 1. The test value and the simulation value of the tightly coupled split reactor’s temperature rise are basically in agreement when the double-arm coil or the single-arm coil is operated under the calculated current. 2. When the double-arm coil is running, the temperature rise of each package is evenly distributed, but the packages in the middle are slightly higher than the packages on the inner and outer sides. When a single arm is running, the temperature rise of the coil gradually decreases from the inside to the outside; 3. The tightly coupled split reactor has the characteristic of small reactance on the single-arm coil, and low magnetic leakage on the double-arm coil. According to the comparison of simulation calculation and test results, the maximum continuous current of the tightly coupled split reactor in the article can reach about 7000 A with double-arm and 3500 A with single-arm, which can meet the requirements of the maximum current of the reactor in the project. The research results can provide a theoretical and reference basis for the temperature rise calculation and temperature rise monitoring of the tightly coupled split reactor.